Electric heater



Jul 3, 1923.

' 1,460,815 L. P. HYNES ELECTRIC HEATER I Filed Feb. 10, 1922 2 Sheets-Sheet 2 ua/iwyzzf til . Patented July 3, 1923.

untrue. STATES 1,46%,815 PATENT OFFEQEQ LEE 1?. HYNES, OF ALBANY, NEW YORK, ASSIG-NOR T0 GONSOLIDATED GAR-EEAKIING COMPANY, OF ALBANY, NEW YORK, .h. CGRPORATION OF WEST VIRGINIA.

nnnornro HEATER.

Application filed February 16, 1922.

T 0 all whom it may concern Be it known that 1, LEE P. HYNEs, a citizen of the United States, residing at Albany, in the county of Albany and State of New York, have invented certain new and useful Improvements in Electric Heaters, the following being a full, clear, and exact disclosure of the one form of my in vention which I at present deem referable.

For a detailed description of t e present form of my invention, reference may be had to the following specification and to the accompanying drawings forming a part thereof, wherein Fig. 1 shows my invention in elementary form;

Figs. 2 and 3 Show it arranged in a way particularly suitable for air heating l;

Figs. at and 5 show its application for tank heating;

Figs. 6, 7 and 8 are modifications.

My electric heater is of the type recently devised by me wherein a tube or duct of re fractory insulatin material is formed on or placed in a ho y of metal or other substance to be heated, and a separable heating coil, preferably of a standard capacity with terminals permanently attached to include between them a predetermined length of wire, is subsequently threaded through the tube and its ends connected electrically to binding blocks set in a pocket or recess at the end of the tube. The present application relates to the form and application of the sheet-metal shell wherein one or more of the aforesaid refractory tubes are enclosed. In a rior application, Serial No. 508,542, filed ctober 18th, 1921, I have shown such a shell as formed from a malleable metal tube which is pressed into a tube of smaller diameter with radiating ribs thereon, except at the ends where it is left off of the original diameter but with a screw thread rolled therein for the reception ofan insulating bushing. The binding blocks for the ex ternal-circuit connections are. in a recess in the said bushing. I- new purpose to construct an enclosing metal shell for the said refractory tube in separate parts, also to extend the sheet which constitutes one of the parts so as to receive one or more additional tubes therein or so as to become the wall of a vessel, container, or compartment wherein is the air, gas, liquid or other substance to be heated.

Serial Ro. 35,584..

Referring to the drawings, Fig; 1 shows a sheet of metal A with a longitudinal semicircular channel, a, with widened ends pressed or indented in it, and B is a similar sheet having a corresponding semi-circular channel 6., These two sheets are placed together face to face with the two channels in alignment to form a metal tube for cont-ainlng the refractory tube l. The widened ends of the metal tube will receive the insulating plug or bushing of my aforesaid device which is shown in. Fig. 5 at 9, the pin suitably shaped to fit the widened en The two sheets will be secured together by any suitable means, as by welding, or by rivets and the rivets may be supplanted or replaced by foldin over the edges or" sheet A upon sheet B. is shown in Fig. 5, a separable heating cons will be threaded through. the refractory tube i and its terminal 16 will be connected by a rod 6 of reduced heat-conducting capacity, to a binding block 8 which is set into the insulating plug or bushing 9 at the bottom of a recess therein. Instead of the separate refractory tube 4-, I may enamel the inside of each channel, as shown in Fig. 8. When the sheets and B are secured together there results, in eiiect, a two-part refractory tube titted inside of the tubular portion of the metal shell. The enameling can be done to better advantage with. the two-part shell than with an integral shell since the enamel be more easily applied and inspected. i

Instead of indenting a half-tube in each ofthe sheets A and B, one of them may be left fiat, as shown in ig. 6, and the other bent to enclose the refractory tube. In that case the refractory tube may be made fiat on one side, as shown in Fig. 6, or it may be sealed in with aheat-insulating cement 10, as shown in Fig. 7. In Fig. 7 the sheet B is rolled with a series or" radiating ribs, and the heat-insulating cement is extended in a layer between the sheets A and B, for which purpose an asbestos sheet may be used together with the cement, or any other suitable heat-insulating material employed.

In Figs. 2 and 3 the sheet A is extended to include a. series. of two or more refractory ducts, and the sheet is then secured at its edges to a suitable support I) but spaced therefrom to permit 0 a circulation on both sides of the sheet of the air or other fluid to be heated. In Fig. 3 the refractory being tubes run verticall while the sheet A is left flat as in Fig. 6. This will permit'a gravitycirculation of the fluid throu h between sheet A and support In igs. 4 and 5 the sheet A is enlarged or extended to form the wall of a tank, in which a liquid, or other desired substance, ma be heated. For this purpose the aforesaid c annels may be indented in the tank wall, on-the side thereof as shown in Fig. 4, or on the bottom as shown. in Fig. 5. Over each indentation is placed similarly indented plate B. Obviousl the late A may be left flat and only the p ate indented as in Fig. 6; One feature of importance is that the electrical connections with the heating coil are made outside of the tank. For example, as ap-" pears in Fig. 4,'the refractory tube 4 may e shortened, whereby a space at the end of the metal tube will be left to form a, recess in which is seated an insulating plate 11, whereon is secured abinding plate or block 12 for receiving the wirejof the external circuit. A rod 6 of reduced heat-conducting capacity secured to one end of the coil has an eye t its outer end through which is passed a screw connecting it' with the bindlug-plate 12. The end of sheet B which covers this recess is made detachable with an opening through it for the entrance of the external-circult wire.

In Fig. 5 I have also shown the wallheaters of Figs. .4 and 5 as supplemented by heaters of my original flattened-tube from extending across the inside of the tank from side to side and also arranged for external connection thereto of the circuit wires. For supportin the end of the-heater a cupped disoA with a central screwthreaded hub is fastened on the inside of the tank wall, the joint being made tight. by a acking gasket if desired. The screw-threa ed end of the heater-shell fits into the hub of the disc. Thus the exposed end of the heater is accessible through an opening in the wall of the tank through which it may project. The end of the heater-shellcontains an insulating plug or bushing,

9, and at the bottom of. a central recess therein is an inserted metal binding-block 8 to which the aforesaid rod 6 is connected. The outside of the tank may be covered with heat-insulating material 10 as hown on the bottom of the tank in Fig. 5, suitable openings therein bein left for the circuit wires.

hat I claim as new and desire to secure by Letters Patent is:

'1. An electric heater comprisin metal shell made in separable parts suitably secured together, a; refractory insulating duct fitted into the shell, and a heating coil extending loosely through the said duct.

2. An electric heater comprising a metal shell divided longitudinally into separable.

parts suitably secured together, a refractory the s ace insulating duct fitted into the shell, and a heating coil extending through the said duct. 3. An electric heater comprising a metal shell made in parallel parts suitably secured together wherein an indented channel is formed, arefractory insulating duct in said channel and a heating coil contained in said duct.

4. An electric heater comprising a metal shell made in parallel parts suitably secured together one being folded over the other at the edge, a refractory insulating duct in, said shell and a heating coil contained in said duct. I

5. An electric heater comprising a metal shell with radiating ribs and split longitudinally along the ribs, fastening means on'the ribs for securing the parts together, a refractory insulating duct in said shell and a heating coil in said duct.

6. An electricheater comprising a metal shell formed in parts suitably secured together and having a channel indented therein, a refractory insulating duct in said channel but shorter than the channel, a heating coil in said duct, and an insulated binding both sheets and suitably secured together, a-

refractory insulating duct inclosed in'said passage and a heating coil contained in said duct.

9. An electric heater shell of tubular'form with longitudinal radiating ribs. said shell being composed of two fiat'sheets, one or both of which has indented in it a channel parallel to the ribs, and means for securing the two sheets together face to face.

10. An electric heater-shell com rising sheets of unequal width one or both 0 which are indented to form a tubular channel suitable to receive a tube of refractory insulation, and means for securing the two sheets together face to face. I

11. An electric heater comprising an extended metal sheet with two or more'tubular channels formed therein, a refractory insulating tube in each channel, and a heating coil in each tube.

12. An electric heater comprising an extended metal sheet with two or more tubular channels therein each channel being split longitudinally, a refractory insulating tube in each channel and a heating coil in each tube.

13 An electric heater comprising a split metal shell formed of sheets one of which has a removable section, a refractory insulating tube in said shell and a heating coil in the said tube.

14. An electric heater comprising a split tubular shell of metal the interior of which is enamelled to form a refractory insulating tube fitted in the shell and a heating coil in said tube.

15. An electric heater comprising a split shell of sheet metal indented to form' a tubular channel and enamelled along the inside of the channel to form therein a refractory insulating tube when the sheets are secured together, and a heating coil in the said tube.

16. An electric heater comprising a tubular metal shell, a refractory insulating' tube therein-split longitudinally, and a heating coil in said tube.

17. An electric heater comprising a tubular metal shell with ribs therein extended to form the wall of a container, a refractory insulating tube in each metal tube and a heating coil in said insulating tube.

18. An electric heater comprising a metal shell constituting the wall of a container with a series of tubular channels therein, a.

refractoryinsulating tube in each of said channels, and a heating coil in each insulating tube.

19. An electric heater comprising a metal shell constituting the wall ofa container with one ormore tubular channels formed therein with an end recess or chamber accessible from outside the container, a refractory insulating tubein each channel and a separable heating coil in each tube with its terminalin said recess or chamber.

20, An electric heater comprising a metal shell constituting the wall of a container with one or more tubular channels formed therein,- a refractory insulating tube in each channel, a heating coil in each tube, and a. hlealtl-insulating covering on one side of said s e 21. An electric heater comprising a sheetmetal container-Wall having one or more channels indented therein, a refractory insulating tube in each channel and a separable heater coil inserted in each tube.

22. An electric heater comprising a sheetmetal tube with extensions therefrom forming the wall of a container, a refractory insulating tube in said metal'tube and a heating coil in said insulating tube with terminals accessible from outside the container.

Signed at Albany, State of New York, ary, 1922.

this 31st day of Janu- LEE P. I-IYNES.

county of Albany and 

